/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1990, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Cimarron D. Taylor of the University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

static const char copyright[] =
    "@(#) Copyright (c) 1990, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <locale.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#include "find.h"

time_t now;                       /* time find was run */
int dotfd;                        /* starting directory */
int ftsoptions;                   /* options for the ftsopen(3) call */
int ignore_readdir_race;          /* ignore readdir race */
int isdepth;                      /* do directories on post-order visit */
int isoutput;                     /* user specified output operator */
int issort;                       /* do hierarchies in lexicographical order */
int isxargs;                      /* don't permit xargs delimiting chars */
int mindepth = -1, maxdepth = -1; /* minimum and maximum depth */
int regexp_flags = REG_BASIC;     /* use the "basic" regexp by default*/
int exitstatus;

static void usage(void);

int main(int argc, char *argv[]) {
  setprogname(argv[0]);
  char **p, **start;
  int Hflag, Lflag, ch;

  (void)setlocale(LC_ALL, "");

  (void)time(&now); /* initialize the time-of-day */

  p = start = argv;
  Hflag = Lflag = 0;
  ftsoptions = FTS_NOSTAT | FTS_PHYSICAL;
  while ((ch = getopt(argc, argv, "EHLPXdf:sx")) != -1) switch (ch) {
      case 'E':
        regexp_flags |= REG_EXTENDED;
        break;
      case 'H':
        Hflag = 1;
        Lflag = 0;
        break;
      case 'L':
        Lflag = 1;
        Hflag = 0;
        break;
      case 'P':
        Hflag = Lflag = 0;
        break;
      case 'X':
        isxargs = 1;
        break;
      case 'd':
        isdepth = 1;
        break;
      case 'f':
        *p++ = optarg;
        break;
      case 's':
        issort = 1;
        break;
      case 'x':
        ftsoptions |= FTS_XDEV;
        break;
      case '?':
      default:
        usage();
    }

  argc -= optind;
  argv += optind;

  if (Hflag) ftsoptions |= FTS_COMFOLLOW;
  if (Lflag) {
    ftsoptions &= ~FTS_PHYSICAL;
    ftsoptions |= FTS_LOGICAL;
  }

  /*
   * Find first option to delimit the file list.  The first argument
   * that starts with a -, or is a ! or a ( must be interpreted as a
   * part of the find expression, according to POSIX .2.
   */
  for (; *argv != NULL; *p++ = *argv++) {
    if (argv[0][0] == '-') break;
    if ((argv[0][0] == '!' || argv[0][0] == '(') && argv[0][1] == '\0') break;
  }

  if (p == start) usage();
  *p = NULL;

  if ((dotfd = open(".", O_RDONLY | O_CLOEXEC, 0)) < 0)
    ftsoptions |= FTS_NOCHDIR;

  exit(find_execute(find_formplan(argv), start));
}

static void usage(void) {
  (void)fprintf(
      stderr, "%s\n%s\n",
      "usage: find [-H | -L | -P] [-EXdsx] [-f path] path ... [expression]",
      "       find [-H | -L | -P] [-EXdsx] -f path [path ...] [expression]");
  exit(1);
}
